package com.mks.demo.websocket;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @Description
 * @Author hailong <1105744725@qq.com>
 * @Version V1.0.0
 * @Since 1.0
 * @Date 2019/5/29 19:26
 */
@Component
@ServerEndpoint(value = "/socket/{id}/{name}")
public class WebSocketServer {

    private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);

    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;

    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 接收id
     */
    private String id = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("id") String id, @PathParam("name") String name) {
        this.session = session;
        //加入set中
        webSocketSet.add(this);
        //在线数加1
        addOnlineCount();
        log.info("有新窗口打开,参数id:[{}],name:[{}],当前监控窗口打开数量:[{}]", id, name, getOnlineCount());
        this.id = id;
        try {
            //sendMessage("连接成功");
        } catch (Exception e) {
            log.error("websocket IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        //从set中删除
        webSocketSet.remove(this);
        subOnlineCount();           //在线数减1
        log.info("有一窗口关闭！当前窗口数为[{}]", getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口:[{}]的信息:[{}]", id, message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送至客户端
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 实现服务器主动推送至客户端
     */
    public void sendMessage(Object object) throws IOException, EncodeException {
        this.session.getBasicRemote().sendObject(object);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message, @PathParam("id") String id) throws IOException {
        log.info("推送消息到窗口:{}，推送内容:{}", id,message);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个id的，为null则全部推送
                if (id == null) {
                    item.sendMessage(message);
                } else if (item.id.equals(id)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(Object object, @PathParam("id") String id) throws IOException, EncodeException {
        log.info("推送消息到窗口:{}，推送内容:{}", id,object);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个id的，为null则全部推送
                if (id == null) {
                    item.sendMessage(object);
                } else if (item.id.equals(id)) {
                    item.sendMessage(object);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }


    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

}
